Explain the use case diagrams. What are the attributes of the use cases?

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Use Case Diagram is a graphical representation of view of the functionality of a technique. It is used in the analysis phase of a project to specify the technique to be developed.
In use case diagrams of the whole technique is defined as actors, use cases, associations, the actors are outside of the technique, as users, program and hardware, USEC is the behavior or functionality of the technique when these agents perform an action, partnerships are the line drawn to show the connection between actors and USEC. An actor can be linked to lots of and one USEC USEC can link to lots of actors.

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